Hard Fork of Project Structure

[Thatsmusic99]

Information

Splits up AT's project into four different submodules:

• Common, where all common non-platform specific code lives
• Spigot, where all Spigot-specific code lives
• Paper, where all Paper-specific code lives
• Hybrid, where both platforms are put into one JAR file, but the plugin decides which codebase is more appropriate to use in a certain scenario

This has become a necessity with Paper's hard forking from Spigot, where it's become a lot harder to tell which code belongs to Paper and which is only available on Spigot. It also makes it easier to catch compilation errors for either platform.

This isn't a perfect split at the moment - the point of this MR is to just get the job done, with further refinement being open down the line.

Also closes #150 as part of this - needs testing

Prior to Merging

• Has the PR been tested?
  • Needs Spigot and Hybrid tested on Spigot server
  • Needs particle-vanish testing
  • Needs new world structure testing for /tpofflh which has been disabled in Spigot
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